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Associations Between Changes in the Pattern of Suicide Methods and Rates in Korea, the US, and Finland Subin Park1, Myung Hee Ahn2, Ahrong Lee2 and Jin Pyo Hong2*

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Associations Between Changes in the Pattern of Suicide Methods and Rates in Korea, the US, and Finland Subin Park1, Myung Hee Ahn2, Ahrong Lee2 and Jin Pyo Hong2* Park et al. International Journal of Mental Health Systems 2014, 8:22 http://www.ijmhs.com/content/8/1/22 RESEARCH Open Access Associations between changes in the pattern of suicide methods and rates in Korea, the US, and Finland Subin Park1, Myung Hee Ahn2, Ahrong Lee2 and Jin Pyo Hong2* Abstract Background: The lethality of the suicide method employed is a strong risk factor for the completion of suicide. We examined whether annual changes in the pattern of suicide methods is related to annual changes in suicide rates in South Korea, the United States (US), and Finland. Methods: We analyzed annual data from 2000–2011 for South Korea and Finland, and 2000–2010 for the US in order to examine trends in the rates and methods of suicide. Data on suicide methods were obtained from the World Health Organization (WHO) mortality database. Results: Along with an annual rapid increase in suicide rates, the incidence of hanging increased steadily while suicide by self-poisoning steadily decreased in South Korea. In the US, along with an annual increase in suicide rates, the proportion of suicides committed by hanging increased while those committed with the use of firearms steadily decreased. In Finland, annual changes in the suicide rate and suicide method were not statistically significant during the study period. Conclusions: Our present findings suggest that the increased use of specific lethal methods for suicide, namely hanging, is reflected in the increased suicide rates in the Korean and the US populations. The most effective approach for reducing overall suicide rates may be the implementation of population-based initiatives that reduce both the accessibility (e.g., access to firearms) and the social acceptability (e.g., effective and responsible regulations for reporting suicide) of lethal methods of suicide. Keywords: Suicide, Method, Hanging Background behavior with sharp objects having lower fatality (less In 2012, South Korea had the highest suicide rate of all than 5%) [2,3]. National studies on suicide indicate that countries in the Organization for Economic Cooperation the preferred suicide method varies between countries. and Development (OECD) [1]. In recent years, suicide Some patterns are well known, such as the high propor- rates have increased rapidly and steadily in South Korea: tion of firearm suicides in the United States [4] and the in 1990 an average of 9.8 suicides per 100,000 individ- prevalent pesticide suicide in Asian countries in the uals were observed, and in 2012 the rate was 33.5 1990s [5]. Hanging was the most prevalent suicide suicides per 100,000 individuals. methods in many countries including European coun- The lethality of the chosen suicide method is a strong tries [6], Australia [7], and Canada [8]. In South Korea, risk factor for suicide completion [2]. Use of firearms use of firearms is very rare, because of strict government and hanging are two of the most lethal suicide with over restrictions limiting firearms [9]. Hence, a trend toward 80% case fatality while self-poisoning and self-injurious increased use of hanging among Koreans may partially explain the increased suicide rates. In our present study, we examined whether annual * Correspondence: [email protected] 2Department of Psychiatry, Asan Medical Center, Ulsan University College of changes in the pattern of suicide methods is related to Medicine, 388-1 Pungnap-2dong, Songpa-gu, Seoul 138-736, South Korea the annual change in suicide rates in South Korea. We Full list of author information is available at the end of the article © 2014 Park et al.; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Park et al. International Journal of Mental Health Systems 2014, 8:22 Page 2 of 7 http://www.ijmhs.com/content/8/1/22 used suicide victims in the United States and Finland as cause of death was 100% in all three countries. The rate of the comparison group for an investigation of trends in ill-defined causes in cause-of-death registration was 15.4% suicide rates and methods in South Korea. The United in South Korea, 6.7% in the United States, and 2.4% in States, where guns are more available, is selected to Finland in 2010. examine the effect of use of firearms, one of the most le- We performed Spearman correlation analyses to assess thal method, on suicide rates. Finland is selected because trends in suicide rates over the 12-year period and it is the first country to establish a research-based com- potential correlations between specific suicide methods prehensive national program for suicide prevention, and suicide rates. All statistical analyses were performed which significantly decreased national suicide rates and using SPSS (version 21.0; SPSS Inc., Chicago, IL), with earned praises from around the world [10]. In the statistical significance defined as an alpha level of 0.05/ United States, the suicide rate has increased steadily (5 types of suicide methods × 3 countries) = 0.0033. since 2000 (10.4 suicides per 100,000 individuals), with 12.6 suicides per 100,000 individuals in 2010. However, Results the extent of change in suicide rates was not as rapid Annual suicide rates in South Korea and Finland in the United States compared with South Korea. In between 2000 and 2011 as well as annual suicide rates in Finland, the suicide rate has decreased since 1990, with the United States between 2000 and 2010, are shown 30.3 suicides per 100,000 individuals in 1990, 22.5 sui- in Figure 1. During this period, suicide rates for males in cides per 100,000 individuals in 2000, and 16.9 suicides South Korea rapidly increased from 18.8 to 43.3 suicides per 100,000 individuals in 2011 [11]. We hypothesize per 100,000 individuals, and from 8.3 to 20.1 suicides that the increased use of more lethal methods such as per 100,000 individuals for females. On the other hand, hanging and firearms may be associated with the in- suicide rates among the Finnish population decreased crease in the total suicide rates, and that this association from 34.56 to 26.76 suicides per 100,000 individuals for may be more prominent in countries where the use of males and 10.94 to 7.29 suicides per 100,000 individuals less lethal method is replaced by more lethal method, for females. The United States suicide rate slightly but than in countries where the use of one specific lethal steadily increased from 17.1 to 20.2 suicides per 100,000 method of suicide is replaced by other specific lethal individuals for males and from 4.0 to 5.2 suicides per method. 100,000 individuals for females. In South Korea, self-poisoning was the most common Methods method of suicide for both males and females until the We analyzed annual data during the period 2000–2011 early 2000’s. The rate of self-poisoning significantly and to examine trends in suicide rates and suicide methods steadily decreased since 2001 (r = −0.96, P < 0.001 for both in three countries. Data on suicide rates and methods males and females). In contrast,therateofhangingsignifi- among people aged 10 years over were obtained from cantly increased (r = −0.96, P < 0.001 for males and r = 0.93, the World Health Organization (WHO) mortality data- P < 0.001 for females), and hanging has been the most com- base [11]. The most recent data were from 2011 for mon method of suicide among Korean males since 2003 South Korea and Finland, and from 2010 for the United and among Korean females since 2005 (Figure 2). For States. Suicide methods were classified into five categor- both Korean males and females, there was a significant ies according to the ICD-10 codes: self-poisoning (X60– positivecorrelationbetweensuiciderateandtherateof X69), hanging (X70), firearms (X72–74), jumping from a hanging (r = 0.90, P < 0.001 and r = 0.95, P <0.001, re- high place (X80), and others (X71, X75–X79, X81–X84). spectively), and a negative correlation between suicide The WHO obtains data on deaths that includes age, rate and both the rate of poisoning (r = −0.88, P < 0.001 sex, and cause of death, as reported annually by member and r = −0.98, P < 0.001, respectively) and the rate of states through civil registration systems (e.g., the Korean other methods (r = −0.92, P < 0.001 and r = −0.95, P < 0.001, National Statistical Office, the National Center for respectively). Health Statistics of the United States, and the Statistics During the study period, firearms were the most Finland), and compiles the data in the WHO mortality common method of suicide in American males; how- database. Based on country-reported data and the use of ever, the rate of suicide by firearms decreased signifi- additional data sources such as population censuses and cantly (r = −0.92, P = 0.001), and the rate of hanging household surveys, the WHO and its partners regularly increased significantly (r = 0.97, P < 0.001) in the United estimate key mortality statistics to improve data compar- States. Between 2001 and 2010, poisoning was the most ability across countries and years. In addition, the WHO common suicide method among American females. estimates the completeness and coverage of reported data, During the same period in the United States, firearms and assesses the quality of cause-of-death data.
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